The leaves of kumquat fall off, which may be caused by too little watering. It needs to be watered once a day to keep the soil moist. It may also be caused by pests and diseases. We can spray some chemicals, or it may be because there are too few. We need to apply a decent fertilizer to kumquat trees every once in a while to provide the needed nutrition.

1. If leaves fall off due to too little watering, water can be poured at least once a day to keep the soil moist, and a small amount of ferrous sulfate can be added to increase the acidity of the soil. 2. If the kumquat tree has diseases and insect pests, we can use disinfectant to clean the kumquat tree, and its leaves can also be sprayed with pesticides such as Baichongling every other week. 3. If the kumquat tree lacks nutrition during its growth, we can apply nitrogen fertilizer to it once or twice a month to provide it with the nutrition it needs and make it grow better.